Telephone system



L. POLINKOWSKY TELEPHONE SYSTEM Mar. 13,1923.

2 sheets-sheet 1 Filed Apr.

lnyg-w fur- Fatented Mar. 13, 11923) v sates re atta ant eas TL IPAEQLTNKQWSKY, OF ANTWERP, BELGIUM, ASSIGNOR T0 WESTERN ELECTRIC @QTTEANY,TNCORPORATED, OF NEW YORK, IN. Y., A CQRPO 'rnnnrnou'n srsrnm;

Application filed April 29, 1920. Serial N'o. 377,708.

To all whom it may concern,"

Be it known that I, LIPA POLINKOWSKY,

a .citizen of Russia, residing at Antwerp,-

Belgium, have invented certain new and useful Improvements in TelephoneSys-- individual to any of the several substations on the line isoperated in response to calls initiated at such substations.

A feature of the invention consists in the provision of means wherebythe preliminary or finder switch, which serves to automatically extendparty lines, is variably operated dependent on the particular substationat which the call is initiated and determines by such variable operationthe selection and operation of the messageregister individual to thecalling substation.

Other features of the invention will become apparent from aconsideration of the following description and the appended claims.

In the drawings, Fig. 1 shows a telephone line equipped with foursubscribers sub-- stations and terminating in the multiple contacts offinder switches in the exchange. This figure also shows fourmessage'registers, one individual to each of the subscriberssubstations, for charging the calls made on the party line. Fig. 2 showsthe detailed circuits of a connecting link com prising a line finderswitch and a first group selector switch for extending the party lines.This figure also contains a diagrammatic illustration of a second groupselector switch and a register-controlling mechanism for controlling theswitches.

The finder and group-selector switches disclosed in this system are ofthe wellknown rotary power-driven type. The detailed operation of theseswitches and also of the register-controlling mechanism, which controlsthe selective movements of the group selectors, may be substantially thesame as that described in detail 'in the British patent issued toWestern Electric Company, Limited, Number 146,517, accepted October 5,1921. 1

According to the system in which the present invention is embodied, theparty lines, such as the'one shown in Fig. 1, are

arranged to appear in a plurality of positions in the multiple bank ofthe line finder switches. Each party line is provided with as many setsof terminals in the finder bank as' there are substations on the line,these sets of-terminals beingindividual respectively to the severalsubstations. A plurality of line relays, associated with the party line,arearranged to be operated in difier 'ent' combinations, responsive tothe initiation of calls at the subscribers substations. In addition tothe usual equipment at the subscribers substations, there is providedmeans for producing a momentary electrical condition on the party lineon the initiation of the call at any of the substations. This means isso designed that each of the subscribers substations produces anelectrical condition on the line which is characterwhich the line relaysare energized, the line finder switch is started in operation toautomatically seize the set of terminals in the finder bankv which isindividual to the calling substation. The seizure of the particular setof terminals, which identifies the calling substation, determines theselection and operation of the message register individual to thecalling substation to the exclusion of the remaining registers of theparty line.

, In the following detailed description of the operation of the systemit will be assumed that the subscriber at substation 101 on the partyline 131, 132 wishes to hold conversation with the subscriber atsubstation 200. For simplicity the called line is shown as an ordinarysingle substation line. When the subscriber at substation 101 removeshis receiver from the switchhook 133 to initiate the call, a spring 134is momentarily pressed into engagement with its cooperating contact bythe upward movement of said switchhook. The.closure of the contactspring 134 completes a circuit from ground through the contacts of saidsprings, conductor 131', lefthand armature and contact of relay 108,lefthand winding of line relay 105, left-hand winding of line relay 106,to battery and ground. Relays 105 and 106 become energized in thiscircuit and a circuit is established from battery through the right-handwinding of relay 108, armature and contact of relay 109, armature andfront contact and right-hand winding of relay 105, right-hand armatureand back-contact of relay 107, resistance 119, winding of start relay110 to ground. Relay 105 looks up in this circuit but relay 108 does notreceive sufficient current in series with resistance 119 and the windingof relay 110 to become energized. As soon as contact spring 134 againopens as the switchhook 133 reaches the extent of its upward movement,relay 106 becomes deenergized. The start relay 110 also energizes inseries with the right-hand winding of relay 105 and establishes acircuit from ground through its armature and contact, conductor 135,contact 201 (1) of sequence switch 210, winding of relay 202 to batteryand ground. Relay 202 energizes and completes a circuit from batteryover sequence switch contact 204 (1) winding of the power magnet 203 ofthe line finder switch, back contact and armature of relay 206, frontcontact and armature of relay 202, back contact and armature of relay211 to ground. The power magnet 203 energizes and causes the rotation ofthe brush carriage of the finder switch carrying the brushes 230, 231,232 and 233 over the terminals of the bank in search of the particularset of terminals individual to' the substation of the party line thathas initiated the call. Then the brushes 230, 231, 232 and 233 makeengagement with the terminals 123, 124', 125, and 126, individual to thesubstation 101, a circuit is closed from battery through the righthandwinding of relay 108, armature and contact of relay 109, armature andfront contact and right-hand windingof relay 105, right-hand armatureand back contact of relay 107, resistance 119, terminal 126, brush 233,contact 215 (1), right-hand high resistance winding of test relay 205,back contact and lower armature of relay 213, contact 229 (1), contact237 of the sender selector sequence switch 220 to ground. The test relay205 energizes in this circuit and prepares a low resistance path toground through its left-hand low resistance winding and contact andarmature, resistance 'coil 28.1 and winding of relay 206. When thebrushes of the finder switch are accurately centered on the terminals ofthe calling line, the interrupter 136 is opened to remove the shunt fromaround relay 206. Relay 206 thereupon energizes in series with thelefthand winding of relay 205. The low resistencc circuit including theleft-hand winding of relay 205 and the winding of relay 206 so reducesthe potential on test terminal 126 as to render the terminals individualto the calling substation non-selectable by other finder switches. Theattraction of the armature of relay 206 opens the circuit of powermagnet 203 thus causing the brushes 230, 231, 232 and 233 to come torest in engagement with the desired set of terminals. A circuit is alsocompleted from battery through the winding of holding magnet 241,contact 240 (1), contact 222 (1), front contact and armature of relay206, front contact and armature of relay 202 to ground at the backcontact and armature of relay 211.

The magnet 241 energizes and acts on the brush carriage to cause theaccurate centering of the brushes on the selected set of terminals.Furthermore, relay 206, by attracting its armature, completes a circuitfrom battery through the winding of sequence switch 210, contact 222(1), front contact and armature of relay 206, front contact and armatureof relay 202, back contact and armature of relay 211 to ground. Sequenceswitch 210 energizes and moves from position 1 into positi0n 4.

On leaving position 2 contact 201 is opened to permit the deenergizationof relay 202. \Vhen sequence switch 210 reaches position 3, a circuit isclosed from ground over contact 214 (3 to'l3), upper armature and backcontact of relay 213, winding of relay 207, brush 232, terminal 125,winding of message register magnet 114, winding of cutoff relay 109,through the two windings in series of cut-off relay 108 to battery andground. Relay 108, which receives suificient current in this c rcuit tobecome energized, disconnects the calling line 131, 132 from the linerelays to prevent the initiation of other calls on said line. Relays 109and 207 also energize in the circuit just traced. The relay 109 opensthe circuit of line relay 105 permitt'ng this latter relay to releaseits armature. The message register 114, which is individual to thecalling substation 101, does not receive sufiicient current in serieswith relays 108, 109 and 207 to operate. As soon as relay 207 attractsits a'rmatures. in position 3 of sequence switch 220, relay 211-isenergized in series with the calling line by means of the followingcircuit: battery, through the winding of relay 211, contact 212 (2 to4), contact and lower armature of relay 207, brush 231, terminal 124,conductor 132, over the loop of the calling substation 101, conductor131, terminal 123,-

Lecama brush 230, upper armature and contact of relay 207, contact, 208(2 to 4), winding of retardation coil 209 to ground.

' In position 4 of sequence switch 210, an idle register-controllingmechanism, such as the one generally designated at 242, is associatedwith the link circuit comprising the I line finder and first groupselectorswitch'. For this purpose a selecting sequence switch 220 isprovided for'automatically testing and associatin an idle controllingmechanism with the llIlk circuit.

It may be well to note at this point that the sequence switch contacts,below the horizontal broken line in Fig. 2, are controlled by theselecting sequence switch 220, the remaining contacts in. said figurebeing controlled by the sequence switch 210.

The circuit for initiating the operation of sequence switch 220 may betraced from battery through the winding of said sequence switch, contact236 (4), back contact and armature of relay 206, contact 229 (4),contact 237, closed in some position from 1 to 10, to ground. Whensequence switch 220 reaches a position corresponding to an idleregister-controlling mechanism, a circuit is completed from ground overcontact 237, closed in one of its half positions, conductor 243,right-hand high resistance winding of relay 205, contact 227 (4),contact 244 to battery through the winding of a relay, such as 245, inthe register-controlling mechanism. Relay 205 energizes and closes a lowresistance path to ground through its lefthand winding and contact andarmature and the winding of relay 206. Relay 206 becomes energized andopens the circuit of sequence switch 220. The attraction of the armatureof relay 206 also completes a circuit from battery, through the windingof sequence switch 210, contact 222 (4)., front contact andarmature ofrelay 206 contact 229 (4) to groundat contact 237. equence switch 210thereupon moves from position 4 into position 5. For a detailedexplanation of" the manner in which an idle registercontrollingmechanism istested and seized by sequence switch 220 and rendered busyto other selecting sequence switches, reference is made to theabove-mentioned British Patent No. 146,517, accepted October 5, 1921.

With sequence switch 210 in position 5, the calling line is extended byway of contacts 208 and 212, conductors 246 and 247, contacts 248 and249 of sequence switch 220, and conductors 250 and'251'to the selectedregister-controlling mechanism. In the manner described in theabove-mentioned application, the calling subscriber now proceeds totransmit impulses to position the registers,

of the controlling mechanism in accordance with the called linedesignation.

After the registration has been set up and the controlling sequenceswitches of the register-controlling mechanism advanced to the properpositions, the fundamental circuit is closed for controlling thebrushselecting operation ofthe first group selector switch. Thefundamental circuit may be traced from battery, through the winding ofrelay 202, contact 228 (5), contact 252, winding of stepping relay 253,contact and armature of relay 254, contact 255 to ground. Relay 202attracts its armature and completes a circuit from battery, through thewinding of sequence switch 210, contact 222 (5), front contact andarmature of relay 202, back contact and armature of relay 211 to ground.It will be observed that relay 211 deenergized when sequence switchcontacts 208 and 212 passed out of position 4. Sequence switch 210becomes energized in this circuit and advances from position 5 intoposition 6. In position 6 of sequence switch 210, a circuit is completedfrom battery through the winding of the trip spindle power magnet 224,contact 225 (6), front contact and armature of relay 202, back contactand armature of relay 211 to ground. The power magnet 224 energizes andcauses the rotation of the trip spindle from one brushtripping positionto another. As soon as the register which controls the brush-selectingoperation has been satisfied, the fundamental circuit is opened andrelay 202 releases its armature. The retraction ofi the armature ofrelay 202 opens the circuit of power magnet 224, causing the tripspindle to stop in position to trip the desired set of brushes 256, 257and 258. Relay 202 also completes a circuit from battery through thewinding of sequence switch 210, contact 221 (6'), back contact andarmature of relay 202, back contact and armature of relay 211 to ground.Sequence switch 210 is driven out'of position 6. As soon as sequenceswitch 210 reaches position 7, the relay 202 is again energized by means110 of a circuit from battery through the winding of said relay, contact227 (7 to 9), con- 'tact 244 to ground by way of a contact,

such as 260, at the register-controlling mechanism. Relay 202, byattracting its armature, opens the driving circuit of sequence switch210, whereupon said sequence switch comes to rest in position 7.

In position 7 of sequence switch 210, the power magnet 219 is energizedfor rotating the brush carriage which carries the brushes 256, 257 and258 to'select an idle trunk leading to a second group selector. Thecircuit for magnet 219 may be traced from battery through the winding ofsaid magnet, contact 223 (7), back contact and armature of relay; 206.front contact and armature of relay 202, back contact and armature ofrelay 211 to ground. The test terminals 265 of .idletrunks areidentified by &

ture, resistance coil 281 and the winding of relay206. This lowresistance circuit reduces the potential on terminal 265 to render theselected trunk busy ,to other group selector switches. With the brushes256, 257 and 258 accurately centered on terminals 263, 264 and 265, theinterrupter brush 266 breaks engagement with the contact strip 267 andremoves the shunt from around the winding of relay 206. Relay 206thereupon energizes in series with the left-hand winding of relay 205and opens the circuit of power magnet 219. Relay 206 at the same timecloses a circuit from battery thnough the winding of holding magnet 268,contact 240 (7), contact 222 (7 front contact and armature of relay 206,front contact and armature of relay 202, back contact and armature ofrelay 211 to ground. The holding magnet 268 operates on the brushcarriage to stop the brushes accurately in engagement with the trunkterminals. Relay 206 also closes a circuit from battery through thewinding of sequence switch 210, contact 222 (7 to 8), front contact andarmature of relay 206, front contact and armature of relay 202 to groundat'the back contact and armature of relay 211. Sequence switch 210 movesfrom position 7 over position 8 and into position 9.

' In position 9 of sequence switch 210, the.

fundamental circuit including conductors 270 and 271 is closed by way ofcontacts 228 and 234 through to the second group selector switch whosebrushes are shown at 272 and 273. The second group selector, and as manysucceeding switches as may be required in the extension. of theconnection, are operated under the control of the register-controllingmechanism in the manner described in the above mentioned British PatentNo. 146,517, accepted October 5, 1921. When the switches have all beenpositioned and the connection established to the called line, theregister-controlling mechanism 242 advances to a point where contact 260is ope ed. The opening of contact 260 severs the above-traced circuitwhich, up to this time, has been maintaining the energization of relay202. Relay 202 releases its armature and completes a circuit frombattery through the winding of sequence switch 210,

contact 221 (9),.back contact andarmature driven from position 9 intoposition 10. In

this position a circuit is closed over contact 216 and the back contactand armature of relay 217 for driving sequence switch 210 into position11.

In position 11, relay 211 is again energized in series with a callingline and the retardation coil 209, its circuit being closed by contacts208 and 212 (10 to 14). When the called subscriber answers by removinghis receiver from the switchhook, a circuit is established from batterythrough the winding of relay 217, contact 235 (10 to 12), brush 257,terminal 264, brush 273, terminal 274, over the loop of substation 200,and returningby way of terminal 275, brush 272, terminal 263, brush 256,contact 234 (10 to 12), winding of retardation coil 218, front contactand armature of relay 211 to ground. Relay 217 becomes energized andcompletes a circuit from battery through the winding of sequence switch210, contact 222 (11), front contact and armature of relay 217 toground. Sequence switch 210 moves from position 11 into position 12,which is the talking position.

After the conversation has been completed and the calling and calledsubscribers have restored their receivers to the switchhooks, relays 211and 217 become deenergized. Relay 211 closes a circuit from groundthrough its armature and back contact, armature and back contact ofrelay 202, contact 221 (12 to 13), winding of se uence switch 210 tobattery and ground. equenceswitch 210 moves out of position 12 overposition 13 and into position 17. In this position a circuit is closedfrom battery through the winding of the brush carriage power magnet 219,contact 223 (17), back contact and armature of relay 206, contact 229(17 to 18) to ground at contact 237. It will be observed 1: at therelays 205 and 206 were deenergized as sequence switch contact 215passed quence switch 210,'contact 222 (16 to 18),

front contact and armature of relay 206, contact 229 (17 to 18), contact237 to ground. Sequence switch 210 energizes in this circuit and movesfrom position 17 into position 1.

When sequence switch 210 passes through positions 14 to 16 in responseto the deenergization of relay 211, the following circuit is closed foroperating the message register 114 individual to the calling substation101 on the party line: Positive pole of battery 238, resistance 239,contact 214 (14 to 16), upper armature and back contact of relay 213,winding of relay! 207, brush 232, terminal 125, winding of messageregister magnet 114, windings of relays 109 and 108, to the negativepole of battery and ground. The additional flow of current in thiscircuit caused by the application of battery 238 is sufiicient tooperate the message register 114 to charge the call against thesubscriber of substation 101. The cut-off relays 108 and 109 aredeenergized as soon as sequence switch 210 leaves position 16 toreassociate the line relays 105, 106 and 107 With the party line forsubsequentcalls.

In the event that the called line is found busy or that the calledsubscriber fails to answer and the calling subscriber is obliged toabandon the call without having obtained a conversation with the desiredparty, it is necessary to provide means to prevent the charging of suchan unsuccessful call. It will be remembered that the sequence switch 210advanced from position 9 into position 10 and then into position 11responsive to a circuit change produced in the register-controllingmechanism after the connection had been established through to thecalled line. The sequence switch 210 waits in position 11 for theremoval of the receiver from the switchho'ok at the called substation,whereupon it moves into position 12. If the call proves to beunsuccessful, the sequence switch 210 remains in position 11 and uponthe calling subscriber replacing his receiver on the switch hook, relay211 deenergizes and closes the following circuit: ground, through thearmature and back contact of relay 211, armature and back contact ofrelay 202, contact 221 (11), resistance 269, upper winding of relay 213,to battery and ground. Relay 213 energizes and completes a circuit frombattery through the winding of sequence switch 210, lower winding andfront con-- tact and lower armature of relay 213, contact 229 (9 to 14),contact 237 to ground. Sequence switch 210 energizes in series with thelower winding of relay 213 and moves from position 11 over positions 12and 13 and into position 17. Since the relay 213 is energized whilesequence switch- 210 is passing through positions 14 to 16, theabove-traced circuit for the application of battery 238 is maintainedopened at the upper armature and back contact of relay 213. The messageregister 114, therefore, does not operate to charge the call against thecalling subscriber.

In position 17 of sequence switch 210, the group selector is restored toits normal position in the manner above described.

Assume next that the subscriber at substation 102 on the party line 131,132 wishes contact and left-hand armature of relay 108,

conductor 131, spring 138' to ground. Relays 105 and 106 becomeenergized in this circuit. With relays 105, 106 and 107 simultaneouslyenergized, a circuit is completed from battery through the right-handwinding of relay 108, armature and contact of relay 109, armature andfront contact and right-hand winding of relay 105, right-hand armatureand front contact and right-hand winding of relay 107, resistance 120,winding of start relay 111 to ground. Relays 105 and 107 lock up inseries with relay 108. Relay 106, however, deenergizes as soon asthespring contact 138 is opened, since the locking cirsuit for theright-hand winding of this relay is opened at the back contactandarmature of relay 105. The energization of the start relay 111 initiatesthe operation of the line finder switch in the manner above described.The finder switch continues to operate until its brushes at 230, 231,232 and 233 engage the terminals 127, 128, 129 and 130, individual tothe substation 102 on the party line. A selectable potential now occurson the terminal 130, the circuitfor applying this potential beingtraceable from battery through the right-hand winding of relay 108,armature and contact of relay 109, armature and front contact andright-hand Winding of relay 105, right-hand armature and front contactand right-hand winding of relay 107, resistance 120 to the terminal 130.If a call is initiated by the subscriber at substation 103, contactspring 140 momentarily closes a circuit from battery through the middlewinding of relay 107, contact and right-hand armature of relay 108,spring 140 to ground. Relay 107 energizes and locks up in a circuit frombattery through the right-hand winding of relay 108, armature andcontact of relay 109, armature and back contact of relay 105, lefthandarmature and contact and left-hand winding of relay 107, armature andback contact of relay 106, resistance 121, winding of relay 112 toground. Relay 112 initiates the operation of the line finder switchwhich continues to operate until its brushes are in engagement with theterminals 141, 142, 143 and 144, individual to the substation 103.

When a call is initiated at substation 104,

closes both contact spring 145 momentarily sides of the line 131 and 132in series.

circuit is then established from battery ductor 131, armature andcontact of relay 108. left-hand winding of relay 105, lefthand windingof relay, 106, to battery 139 and ground. It will be observed, that thebattery 139, which is of comparatively low potential, is opposed by thebattery connected in series with the middle winding of relay 107. Relay106 is arranged to energize, as above explained, by current flowing frombattery 139 to ground at the substations. Relay 105, however, does notreceive sufficient current to energize in the circuit just traced wherebattery 139 and the battery at the middle winding of relay 107 areconnected in opposition to each other. Hence, when a call is initiatedat substation 104, re-

- lays 106 and 107 energize and relay 105 remains deenergized. A circuitis then closed from battery through the right-hand winding of relay 108,armature and contact of re lay 109, armature and back contact of relay10.5, left-hand armature and contact and lefthand winding of relay 107,armature and front contact and right-hand winding of relay 106,resistance 122, winding of start relay 113 to ground. Relay 113initiates the operation of the finder switch which con tinues to moveuntil its brushes engage the terminals 146, 147, 148 and 149, individualto the substation 104.

The message registers 115, 116 and 117 are individual respectively tosubstations 102, 103 and 104, and are operated as explained whenevercalls initiated by these substations are successfully completed.

What is claimed is:

1. In atelephone system, a telephone line having a plurality ofsubscribers substations thereon, a plurality of registering devices, avariably operable automatic switch for extending said line, meansresponsive to the initiation of a call on said line for start ing saidswitch in operation, means dependent on which substation initiatesthe-call for determining the operation of said switch, and meansdependent upon the operation of said switch for selecting one of saidregistering devices.

2. In a telephone system, a telephone line having a plurality ofsubscribers substations thereon, a plurality of registering des vicesone for each of said substations, a variably operable automatic switchfor extending said line, means responsive to the initiation of a call onsaid line for starting said switch in operation, means dependent onwhich substation initiates the call for determining the operation ofsaid switch, and means dependent on the operation of said switch forselecting the registering device individual to the calling substation.

3. In a telephone system, a telephone l1ne having a plurality ofsubscribers substations thereon, a plurallty of registering devices, avariably operable automatic switchfor extending sald line, a pluralit ofsets of terminals for said line in sai switch, means responsive to theinitiation of a call on sald line for starting said switch in operation,means dependent on which substation 1nitiates the call for stop ing saidswitch in engagement with one 0 said sets of term1- nals, and meansdependent on the set of terminals chosen by the automatic switch. forselecting one of said I'GgIStBI'IIIgXlGVICBS 4. In a telephone system, atelephone line having a plurality of subscribers substa-' tions thereon,a plurality of registering devices one for each of said substations, avariably operable automatic switch .for extending said line, a pluralityof sets of terminals one for each substation in said automatic switch,means responsive to the inltiation of a call on said line for startingsaid switch in operation, means dependent on which substation initiatesthe call for stopping said switch in engagement with the set ofterminals individual to the calling substation, and means dependent onthe set of terminals chosen by the automatic switch for selecting theregistering device individual to the calling substation.

5. In-a telephone system, a telephone line having a plurality ofsubscribers substations thereon, a plurality of message registers, avariably operable finder switch for extending said line. a group ofrelays responsive to the initiation of calls on said line and arrangedto be operated in variable combinations dependent on which substationinitiates the call, means dependent on the combination of said relaysoperated for determining the operation of said finder switch. and meansdependent on the operation of said switch for selecting one of saidregisters.

6. In a telephone system, a telephone line having a plurality ofsubscribers substations thereon, a plurality of message registers, avariably operable finder switch for extending said line, meansresponsive to the initiation of a call on said line for starting saidswitch in operation, means dependent on which substation initiates thecall for determining the operation of the finder switch, means forfurther extending said line to establish a talking connection, meansdependent on the operation of said finder tions thereon, a plurality ofmessage registers, a variably operablefinder switch for extending saidline, means responsive to the initiation of a call on said line forstarting the finder switch in operation, means dependent on whichsubstation initiates the call for determining the operation of saidswitch, a'called line, means for further extending the calling line toestablish a connection with said called line, means dependent on theoperation of said finder switch for selecting one of said memageregisters, and means under the'control of the called subscriber foroperating the selected register.

having a plurality of subscribers substations thereon, a plurality ofregistering devices, a variably operable automatic switch for extendingsaid line, means dependent on which one of said substations initiates acall for determining the operation of said switch, and means dependenton the operation of said switch for selecting one of said registeringdevices.

9. In a telephone system, atelephone line having a plurality ofsubscribers substations thereon, a plurality of register devices, avariably operable automatic switch for extending said line, meansdependent on which substation initiates a call for determining theextent of operation of said switch, and means dependent on the extent ofoperation of said switch for selecting one of said register devices.

10. In a telephone system, a telephone line having-a plurality ofsubstations thereon, a characteristic device at each substation renderedeffective when a call is initiated thereat, a variably operableautomatic switch for extending said line, means re-' 'sponsive to theinitiation of a call on'said line for starting'said switch in operation,

means dependent on which one of said characteristlc devices is renderedeffective for determining the operation of said switch, and.

8. In a telephone system,a telephone line operable switch for extendingsaid line, a

group of relays responsive to the initiation of calls on said lines andarranged to be operated in variable combinations dependent on whichsubstation initiates the call, means dependent on the particularcombination of said relays operated for determining the extent ofmovement taken by said switch, and means dependent on the extent ofmovement taken by said switch for selecting one of said registers.

13. In a telephone system, a telephone line having a plurality ofsubstations thereon, a plurality automatic switch for extendin said linein a talking connection, means ependent on which one of the substationsinitiates a call for determining the extent of operation of said switch,and means dependent upon the operation of said switch for selecting oneof said registers.

14. In a telephone system, a telephone line having a plurality ofsubstations thereon, a plurality of registering devices, a variablyoperable automatic switch for extending said line to vestablish atalking connection, means responsive to the initiation of a call on saidline for starting said switch in operation, means dependent on whichsubstation initiates the call for determining the operation of saidswitch, means dependent upon the operation of said switch for selectofregisters, a variably operable ing one of said registering devices,means for releasing the established connection, and means renderedefiective during the release of the conhection for-operating theselected registering device.

In witness whereof, I hereunto subscribe my name this 2nd day ofApril,A. D.,

LIPA POLINKOWSKY.

